• journal_title：American Mineralogist
• Contributor：Takeshi Sakai ; Eiji Ohtani ; Hidenori Terasaki ; Naoki Sawada ; Yusuke Kobayashi ; Masaaki Miyahara ; Masahiko Nishijima ; Naohisa Hirao ; Yasuo Ohishi ; Takumi Kikegawa
• Publisher：Mineralogical Society of America
• Date：2009-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2009.3123
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：94
• issue：7
• firstpage：921
• section：Articles

Fe-Mg partitioning between perovskite and ferropericlase in the MgO-FeO-SiO₂ system has been studied up to about 100 GPa at around 2000 K using a laser-heated diamond anvil cell (LHDAC). The compositions of both phases were determined by using analytical transmission electron microscopy (ATEM) on the recovered samples. Present results reveal that the Fe-Mg apparent partition coefficient between perovskite and ferropericlase [K_D^Pv/Fp = (X_Fe^PvX_Mg^Fp)/(X_Mg^PvX_Fe^Fp)] decreases with increasing pressure for a constant FeO of the system, and it decreases with increasing FeO content of ferropericlase. The gradual decrease of K_D^Pv/Fp with increasing pressure is consistent with the spin transition in ferropericlase occurring in the broad pressure range from 50 to 100 GPa at around 2000 K.